Infiltration of rainwater

Hello,

in our development area, the rainwater from the roof, carport, and driveway must infiltrate on the property. I had actually thought of letting the rainwater infiltrate through infiltration boxes that are supposed to be located about 6 meters behind the house at a depth of 70-80 cm. However, I find it difficult to calculate the capacity of these boxes.

Overall, we have about 220 sqm of drainage area (the runoff coefficient is taken into account), but I also know that some other factors need to be considered. Regardless, has anyone here built such an infiltration tunnel for a "normal" single-family house under relatively normal soil conditions, and in what size?

Thanks,
Martin

We are waiting for a proposal for the rainwater infiltration from our BU, Graf modules will probably be used! The permeability coefficients (kf values) are also crucial. Our kf values range between 2x10-5 and 2x10-6 m/s. It is also about a single-family house with 197 sqm, I will report!

Thank you VelBau, that would be really very interesting.

Hi,

I've already written this elsewhere.
The manufacturers even calculate that for you free of charge, since the values are available from the [Bodengutachten].

Graf dealers usually calculate for free; with a similar area, we came up with 7 double modules and a 1500l flat tank as a sediment catcher, costing about €1800 with piping, plus about €2200 for excavation, gravel, etc. And all this just so we can get rid of the water again[emoji22] bg td

By the way, I think that a free calculation including infiltration verification should be included in this price.